Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
Sometimes, however, the two are at variance. Now, whenever this occurs, expediency must yield to the demands of what is becoming. Who is there who does not realise that nothing would have contributed more to secure the acquittal of Socrates than if he had employed the ordinary forensic methods of defence and had conciliated the minds of his judges by adopting a submissive tone and had devoted his attention to refuting the actual charge against him?
But such a course would have been unworthy of his character,
And so although Lysias, who was accounted the first orator of that time, offered him a written defence, he refused to make use of it, since, though he recognised its excellence, he regarded it as unbecoming to himself. This instance alone shows that the end which the orator must keep in view is not persuasion, but speaking well, since there are occasions when to persuade would be a blot upon his honour. The line adopted by Socrates was useless to secure his acquittal, but was of real service to him as a man; and that is by far the greater consideration.